存在復(fù)雜非均勻?qū)拥囊痪S大地電磁正演
發(fā)布時(shí)間：2018-04-23 22:05
本文選題：大地電磁測(cè)深 + 非均勻?qū)?/strong>�。� 參考：《桂林理工大學(xué)學(xué)報(bào)》2016年04期
【摘要】：二、三維大地電磁(MT)正反演常采用一維反演結(jié)果作為初始迭代模型或利用一維模型響應(yīng)定義邊界條件,為進(jìn)一步研究復(fù)雜地層條件下的MT響應(yīng),本文推導(dǎo)了非均勻?qū)与妼?dǎo)率隨深度按線性-指數(shù)函數(shù)變化和指數(shù)-線性函數(shù)變化的一維MT正演的解析解形式,在此基礎(chǔ)上對(duì)不同的地層組合情況進(jìn)行討論,分析了非均勻?qū)勇裆�、厚度�?duì)MT響應(yīng)的影響,并與地下介質(zhì)均勻以及非均勻?qū)与妼?dǎo)率隨深度按單一函數(shù)變化的MT響應(yīng)進(jìn)行對(duì)比。結(jié)果表明,既存在線性變化又存在指數(shù)變化的介質(zhì)模型MT響應(yīng)遠(yuǎn)比單一變化介質(zhì)模型復(fù)雜,隨著過(guò)渡層厚度增大、埋深變淺,其視電阻率和相位幅值與均勻介質(zhì)模型響應(yīng)幅值差異變大。
[Abstract]:Second, the forward and inverse modeling of 3D magnetotelluric magnetotelluric (MTT) usually uses one-dimensional inversion results as the initial iterative model or uses the one-dimensional model response to define boundary conditions, in order to further study the MT response in complex strata. In this paper, the analytical solutions of one dimensional MT forward modeling of the variation of conductivity with depth in linear exponential function and exponential linear function are derived. On the basis of this, different formation assemblages are discussed. The influence of the buried depth and thickness of the non-uniform layer on the MT response is analyzed and compared with that of the homogeneous layer in the underground medium and the single function of the conductivity of the non-uniform layer with the change of the depth. The results show that the MT response of the medium model with both linear and exponential variations is much more complex than that of the single medium model. With the increase of the thickness of the transition layer, the buried depth becomes shallower. The apparent resistivity and phase amplitude differ greatly from the response amplitude of homogeneous medium model.
【作者單位】： 桂林理工大學(xué)地球科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41464002,41674075) 廣西自然科學(xué)基金項(xiàng)目(2013GXNSFAA019277) 廣西高�？蒲许�(xiàng)目(2013YB107)
【分類號(hào)】：P631.325
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1 萬(wàn)軍,趙平,閔文彬;風(fēng)速垂直切變下非均勻?qū)咏Y(jié)大氣中重力慣性內(nèi)波的穩(wěn)定性[J];大氣科學(xué);1992年01期
2 張立鳳,張銘;非均勻?qū)咏Y(jié)下的對(duì)稱不穩(wěn)定[J];大氣科學(xué);1997年05期
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